For Traditional Chinese Character input, you can install the Chinese IME (Input Method Editor) in Windows XP and Windows 2000 as well.

When you use Windows 2000:
You have to choose for International Settings. In the Tab General you have to click on advanced. Be sure the checkbox for 10002, 10008, 20000 are checked on.
After your system have been updated, you can install several input methods for Chinese. This you can do in the last tab on the right for international settings. I don't know how this tab is named in English (I'm using a Dutch version)
For Traditional input method (The Chinese Input Method for Cantonese Spoken people) you intstall first for Country Taiwan, and the Fast input method.
Then you will be able to input with radicals. First select the radical for left top and second the radical for right bottom from the character.